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Paint composition and coating film formation method

a coating composition and composition technology, applied in the field of coating compositions, can solve the problems of insufficient scratch resistance of coating films formed from coating compositions, unsatisfactory acid resistance of coating compositions, and insufficient scratch resistance of coating films, etc., to achieve excellent acid resistance, acid resistance, and stain resistance. good

Inactive Publication Date: 2011-12-01
KANSAI PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]The coating composition of the present invention is capable of forming a coating film with excellent finished appearance such as gloss and smoothness because the carboxy-containing reaction product (C) with an acid value of 50 to 200 mg KOH / g and a number average molecular weight of 600 to 5,000 obtained by a half-esterification reaction of an acid anhydride with a polycarbonate polyol having three or more hydroxyl groups per molecule has good compatibility with the carboxy-containing polymer (A) and epoxy-containing acrylic resin (B).
[0020]The coating composition of the present invention is also capable of forming a cured coating film with excellent scratch resistance, acid resistance, stain resistance, etc., because of the following reasons: the reaction product (C) improves the physical properties, such as mechanical strength, of the coating film; and the crosslinkages formed by the reaction of the reaction product (C) and carboxy-containing polymer (A) with the epoxy-containing acrylic resin (B), and the carbonate linkages of the reaction product (C) both have excellent hydrolysis resistance. Further, the coating film formed using the coating composition of the present invention maintains high coating film performance in terms of scratch resistance, acid resistance, stain resistance, etc., for a long time.
[0021]As described above, the coating composition of the present invention achieves the effect of forming a coating film with excellent coating film performance in terms of scratch resistance, acid resistance, stain resistance, gloss, smoothness, etc.

Problems solved by technology

However, the melamine crosslinkage in this coating composition easily undergoes hydrolysis by acid rain; therefore, this coating composition provides unsatisfactory acid resistance.
Coating films formed from this coating composition have improved acid resistance because melamine resins are not used; however, such coating films have insufficient scratch resistance.
However, coating films formed from the coating composition also have insufficient scratch resistance, although they have improved acid resistance.
However, coating films formed from the coating composition still have insufficient scratch resistance, although they have improved acid resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

production example 1

[0144]A 680-part quantity of “Swasol 1000” (tradename of Cosmo Oil Co., Ltd., hydrocarbon organic solvent) was added to a four-necked flask equipped with a stirrer, a thermometer, a condenser tube, and a nitrogen gas inlet; and heated to 125° C. under aeration with nitrogen gas. After the temperature reached 125° C., aeration with nitrogen gas was stopped, and the following monomer mixture I consisting of monomers, solvent, and polymerization initiator (p-tert-butyl peroxy-2-ethylhexanoate), was added dropwise over a period of 4 hours.

Monomer Mixture IStyrene500 partsCyclohexyl methacrylate400 partsIsobutyl methacrylate500 partsMaleic anhydride600 parts2-Ethoxyethyl propionate1,000 partsp-Tert-butylperoxy-2-ethylhexanoate100 parts

[0145]Aging was carried out at 125° C. for 30 minutes under aeration with nitrogen gas, and then a mixture of 10 parts of p-tert-butylperoxy-2-ethylhexanoate and 80 parts of “Swasol 1000” was added dropwise over a period of 1 hour. After cooling to 60° C., ...

production example 2

[0148]A 680-part quantity of “Swasol 1000” was added to a four-necked flask equipped with a stirrer, a thermometer, a condenser tube, and a nitrogen gas inlet; and heated to 125° C. under aeration with nitrogen gas. After the temperature reached 125° C., aeration with nitrogen gas was stopped, and the following monomer mixture II consisting of monomers, solvent, and polymerization initiator (p-tert-butyl peroxy-2-ethylhexanoate), was added dropwise over a period of 4 hours.

Monomer Mixture IIStyrene500 partsCyclohexyl methacrylate400 partsIsobutyl methacrylate880 partsMaleic anhydride220 parts2-Ethoxyethyl propionate1,000 partsp-Tert-butylperoxy-2-ethylhexanoate100 parts

[0149]Aging was carried out at 125° C. for 30 minutes under aeration with nitrogen gas, and then a mixture of 10 parts of p-tert-butylperoxy-2-ethylhexanoate and 80 parts of “Swasol 1000” was added dropwise over a period of 1 hour. After cooling to 60° C., 183 parts of methanol and 4 parts of triethylamine were added,...

production example 3

[0151]A 680-part quantity of “Swasol 1000” was added to a four-necked flask equipped with a stirrer, a thermometer, a condenser tube, and a nitrogen gas inlet; and heated to 125° C. under aeration with nitrogen gas. After the temperature reached 125° C., aeration with nitrogen gas was stopped, and the following monomer mixture II consisting of monomers, solvent, and polymerization initiator (p-tert-butyl peroxy-2-ethylhexanoate), was added dropwise over a period of 4 hours.

Monomer Mixture IIStyrene500partsCyclohexyl methacrylate400partsIsobutyl methacrylate200partsMaleic anhydride900parts2-Ethoxyethyl propionate1,000partsp-Tert-butylperoxy-2-ethylhexanoate100parts

[0152]Aging was carried out at 125° C. for 30 minutes under aeration with nitrogen gas, and then a mixture of 10 parts of p-tert-butylperoxy-2-ethylhexanoate and 80 parts of “Swasol 1000” was added dropwise over a period of 1 hour. After cooling to 60° C., 735 parts of methanol and 4 parts of triethylamine were added, and a...

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Abstract

An object of the present invention is to provide a coating composition capable of forming a cured coating film with excellent scratch resistance, acid resistance, stain resistance, and finished appearance.The present invention provides coating composition comprising (A) carboxy-containing polymer, (B) epoxy-containing acrylic resin, and (C) carboxy-containing reaction product with an acid value of 50 to 200 mg KOH / g and a number average molecular weight of 600 to 5,000 obtained by a half-esterification reaction of an acid anhydride with a polycarbonate polyol having three or more hydroxyl groups per molecule.

Description

TECHNICAL FIELD[0001]The present invention relates to a novel coating composition having excellent coating film performance in terms of scratch resistance, acid resistance, and stain resistance.BACKGROUND ART[0002]Coating compositions that are applied to automobile bodies or like coated objects are required to provide excellent coating film performance in terms of scratch resistance, acid resistance, stain resistance, finished appearance, etc.[0003]Hitherto, melamine crosslinking coating compositions have been widely used as coating compositions for such objects to be coated. The melamine crosslinking coating composition is a coating composition containing a hydroxy-containing resin, and a melamine resin as a cross-linking agent. The melamine crosslinking coating composition has a high crosslinking density during heat curing, and the coating film formed therefrom has excellent coating film performance in terms of scratch resistance, finished appearance, etc. However, the melamine cr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D133/14B05D1/36C09D169/00
CPCC08G59/4246C08L33/00C08L63/00C09D133/062C09D163/00C09D169/00C08L2666/02
Inventor KASAI, REMIHANAOKA, TOSHIYUKINAGANO, TOSHIAKIHARAKAWA, HIROMI
Owner KANSAI PAINT CO LTD
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